html,body{
	background-color:rgba(255,255,255,0);
	padding:0px;
	margin:0px;
}
.window{	
	position:absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	padding:10px;
}
.button{
	pading:5px;
	background:#fff;
	border-style:solid;
	border-width:1px;
	border-color:red;
}